EXC_BAD_ACCESS on mapView - iphone

Question

i get this error and EXC_BAD_ACESS when i run my maps application... any idea
#0 0x3510741c in objc_msgSend ()
#1 0x30a69364 in -[CLLocationManager onClientEventLocation:] ()
#2 0x30a66960 in -[CLLocationManager onClientEvent:supportInfo:] ()
#3 0x30a66b28 in OnClientEvent ()
#4 0x30a5f860 in CLClientInvokeCallback ()
#5 0x30a633e4 in CLClientHandleDaemonData ()
#6 0x357a902c in __CFMessagePortPerform ()
#7 0x3577be46 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ ()
#8 0x3577be04 in __CFRunLoopDoSource1 ()
#9 0x3576e0a4 in __CFRunLoopRun ()
#10 0x3576dd7a in CFRunLoopRunSpecific ()
#11 0x3576dc88 in CFRunLoopRunInMode ()
#12 0x336ace8c in GSEventRunModal ()
#13 0x318f0f94 in -[UIApplication _run] ()
#14 0x318ee4d4 in UIApplicationMain ()
#15 0x0000281c in main (argc=1, argv=0x2ffff5e0) at /Users/abcd/Desktop/wataproject/main.m:14

Answer 1

http://brainwashinc.wordpress.com/2010/01/05/mapkit-crash-getting-user-location/
This helped me solve this issue

Answer 2

#vivianaranha's approach might solve the issue but I believe (after encountering this myself) that you are doing something else bad.
Specifically, in my case I had set mapView.showsUserLocation = YES so under the hood mapView was wiring itself up to the CLLocationManager. The solution was to ensure that I called mapView.showsUserLocation = NO in viewWillDisappear.
Also I discovered that you must have mapView.userTrackingMode set to what you require before you make the call to mapView.showsUserLocation = YES. Putting it all together you end up with something like this:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.mapView.userTrackingMode = MKUserTrackingModeFollow;
self.mapView.showsUserLocation = YES;
self.mapView.delegate = self;
}
- (void)viewWillDisappear:(BOOL)animated {
self.mapView.userTrackingMode = MKUserTrackingModeNone;
self.mapView.showsUserLocation = NO;
self.mapView.delegate = nil;
[super viewWillDisappear:animated];
}